Malicious PDF — malware analysis report

Static analysis result for SHA-256 50350f3bd5452c42…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 02:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62cc82f1109b1ab33ce42c9f96064fd4 SHA-1: e1930231b3e6a97103d28d9383a03ae6b0cde1e0 SHA-256: 50350f3bd5452c4271ba5b35556d020ac32392e3051ddf56630086270aea9f23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically noted as a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=how+to+download+minecraft+pocket+edition+on+android+for+free PDF link annotation
    • https://technoarc.net/userfiles/file/91668989091.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/90358656854.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/juxujutuba.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7473104502.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/fenukukozuviwumi.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/73204756526.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109121503378590.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/66214404618.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/40795592070.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/japoxorixosejunulos.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/dinixefiwukozowoj.pdfIn PDF document text
    • http://innotack.com/userfiles/files/41222286690.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/gujotoduguwer.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/33339076010.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/8668967050.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vitiwov.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/74811718663.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/65419175618.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/tadupofovikix.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/konavopajuliwimugezupoji.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/58678165510.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333aef79e0d---wifudebekowowum.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/58449851725.pdfIn PDF document text
    • http://446888.top/userfiles/file/74112868070.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/10955082511.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6E 18412 bytes
SHA-256: c0b9c639918882666304946cf1ecd9a1fcb2d46c726a704f301ce521f5508d52
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 10784 bytes
SHA-256: 27b638025d6ee4b6b3f1a020be899ae51ab4bb7499a873e53b324b463153f640
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1